Fixing issue with uninstall #57

src/VersionsCheckPlugin.php

@@ -43,11 +43,30 @@ final class VersionsCheckPlugin implements PluginInterface, EventSubscriberInter
      */
     private $options = array();
 
+    /** @var boolean */
+    private $disabled = false;
+
+    /**
+     * @var array
+     */
+    private $classes = array(
+        "SLLH\ComposerVersionsCheck\VersionsCheckPlugin",
+        "SLLH\ComposerVersionsCheck\VersionsCheck",
+        "SLLH\ComposerVersionsCheck\OutdatedPackage"
+    );
+
     /**
      * {@inheritdoc}
      */
     public function activate(Composer $composer, IOInterface $io)
     {
+        // guard for self-update problem
+        foreach ($this->classes as $class) {
+            if (!class_exists($class)) {
+                return $this->disable();
+            }
+        }
+
         $this->composer = $composer;
         $this->io = $io;
         $this->versionsCheck = new VersionsCheck();
@@ -74,6 +93,10 @@ public static function getSubscribedEvents()
      */
     public function command(CommandEvent $event)
     {
+        if ($this->disabled) {
+            return;
+        }
+
         $input = $event->getInput();
         $this->preferLowest = $input->hasOption('prefer-lowest') && true === $input->getOption('prefer-lowest');
     }
@@ -83,7 +106,7 @@ public function command(CommandEvent $event)
      */
     public function postUpdate(Event $event)
     {
-        if (true === $this->preferLowest) {
+        if ($this->disabled || true === $this->preferLowest) {
             return;
         }
 
@@ -97,6 +120,10 @@ public function postUpdate(Event $event)
      */
     private function resolveOptions()
     {
+        if ($this->disabled) {
+            return;
+        }
+
         $pluginConfig = $this->composer->getConfig()
             ? $this->composer->getConfig()->get('sllh-composer-versions-check')
             : null
@@ -121,6 +148,10 @@ private function resolveOptions()
      */
     private function checkVersions(RepositoryManager $repositoryManager, RootPackageInterface $rootPackage)
     {
+        if ($this->disabled) {
+            return;
+        }
+
         foreach ($repositoryManager->getRepositories() as $repository) {
             $this->versionsCheck->checkPackages(
                 $repository,
@@ -131,4 +162,9 @@ private function checkVersions(RepositoryManager $repositoryManager, RootPackage
 
         $this->io->write($this->versionsCheck->getOutput($this->options['show-links']), false);
     }
-}
+
+    public function disable()
+    {
+        $this->disabled = true;
+    }
+}

tests/OutdatedPackageTest.php

@@ -15,9 +15,9 @@ public function testCreation()
         $actual = new Package('foo/bar', '1.0.0', 'v1.0.0');
         $last = new Package('foo/bar', '2.4.3', 'v2.4.3');
         $links = array(
-            $this->getMock('Composer\Package\PackageInterface'),
-            $this->getMock('Composer\Package\PackageInterface'),
-            $this->getMock('Composer\Package\PackageInterface'),
+            $this->createMock('Composer\Package\PackageInterface'),
+            $this->createMock('Composer\Package\PackageInterface'),
+            $this->createMock('Composer\Package\PackageInterface'),
         );
 
         $outdatedPackage = new OutdatedPackage($actual, $last, $links);

tests/VersionsCheckPluginTest.php

@@ -47,7 +47,7 @@ class VersionsCheckPluginTest extends \PHPUnit_Framework_TestCase
     protected function setUp()
     {
         $this->io = new BufferIO();
-        $this->composer = $this->getMock('Composer\Composer');
+        $this->composer = $this->createMock('Composer\Composer');
         $this->config = new Config(false);
 
         $this->composer->expects($this->any())->method('getConfig')